Has to be an error on your side.
Did you delete all "rudiment" from the V2.0. Especially the complete "Dortmund" folder in the...\OMSI\Maps and the depot files in the vehicles folder?
Please do so and then reinstall V2.2.
If it does not work either, please download the SimpleStreetPack which might be necessary in some cases. (see hint in the info box to V2.2 on aerosoft forum)